초록 ▼

A method making a sailboard or surfboard is described, in which a prefabricated foam core has fibrous material wound about it and resin specially set with a reaction retarder is poured onto the fibrous material, whereupon the thus treated foam core is inserted in a molding tool and the mold is close

A method making a sailboard or surfboard is described, in which a prefabricated foam core has fibrous material wound about it and resin specially set with a reaction retarder is poured onto the fibrous material, whereupon the thus treated foam core is inserted in a molding tool and the mold is closed for curing the resin. Desirably, the mold is lined with a surface layer, particularly a deep drawn thermoplastic film, before the treated foam core is inserted. In this way one can make low-weight boards of high strength with relatively low production and material costs.

대표청구항 ▼

A method of making a sailboard or surfboard having a laminated shell, in which a foam core is prefabricated and covered with fibrous mats or fabrics, liquid curable synthetic resin is then poured onto the fibrous material on both sides of the foam core to form a saturated fibrous material and the th

A method of making a sailboard or surfboard having a laminated shell, in which a foam core is prefabricated and covered with fibrous mats or fabrics, liquid curable synthetic resin is then poured onto the fibrous material on both sides of the foam core to form a saturated fibrous material and the thus formed product is cured on the foam core in a closed matched metal mold already lined with a surface layer, wherein before insertion of the foam core covered with the saturated fibrous material into the mold, a thin thermoplastic film forming the surface layer of the board is heated to its converting temperature and is deep drawn into the mold halves by using vacuum, and in that the film is pressed with the synthetic resin layer reinforced by fibrous mats or fabric on closing the mold after insertion of the foam core resulting in an intimate composite of the synthetic resin layer reinforced by fibrous mats or fabric and the film on the one hand and the foam core on the other hand.